StacksVerified U.S. regulatory reference

30 CFR §75.701-1

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
For purposes of grounding metallic frames, casings and other enclosures of equipment receiving power from ungrounded alternating current power systems, the following methods of grounding will be approved:
  1. (a)A solid connection between the metallic frame, casing, or other metal enclosure and the grounded metallic sheath, armor, or conduit enclosing the power conductor feeding the electrical equipment enclosed;
  2. (b)A solid connection to a borehole casing having low resistance to earth;
  3. (c)A solid connection to metal waterlines having low resistance to earth;
  4. (d)A solid connection to a grounding conductor extending to a low resistance ground field located on the surface;
  5. (e)Any other method of grounding, approved by an authorized representative of the Secretary, which ensures that there is no difference in potential between such metal enclosures and the earth.